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2018•Diffusion and defect data, solid state data. Part B, Solid state phenomena/Solid state phenomenaRequires access

Cryomilling and Characterization of Ti/Al2O3 Powders

Jun Yan Wu, Qian Liu, Zhi Hao Wang, Zhi Wang

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Abstract

In order to prevent the oxidation of Ti, which ultimately leads to the generation of intermetallic compound Ti3Al, a new method of cryomill in liquid nitrogen was used to deal with the Ti/Al2O3 powders. The size distribution, phase composite and microstructure of the powders were analyzed using laser particle size analyzer, XRD, and TEM, respectively. Then, the performances of Ti/Al2O3 cermet sintered using cryomilled powders and room temperature milled powders were compared. The results show that, with the increase of cryomilling time, the grain size decreases shapely and high reactivitive nanoscale powders are finally obtained. With the cryomilling in liquid nitrogen, the Ti-N bonds are formed, which successfully prevent the oxidation of Ti. Ti/Al2O3 cermet sintered using cryomilled powders shows higher density, better mechanical properties than that using RT milled powders.

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What this paper is about

In order to prevent the oxidation of Ti, which ultimately leads to the generation of intermetallic compound Ti3Al, a new method of cryomill in liquid nitrogen was used to deal with the Ti/Al2O3 powders. The size distribution, phase composite and microstructure of the powders were analyzed using laser particle size analyzer, XRD, and TEM, respectively. Then, the performances of Ti/Al2O3 cermet sintered using cryomilled powders and room temperature milled powders were compared. The results show that, with the increase of cryomilling time, the grain size decreases shapely and high reactivitive nanoscale powders are finally obtained. With the cryomilling in liquid nitrogen, the Ti-N bonds are formed, which successfully prevent the oxidation of Ti. Ti/Al2O3 cermet sintered using cryomilled powders shows higher density, better mechanical properties than that using RT milled powders.

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Available abstract

In order to prevent the oxidation of Ti, which ultimately leads to the generation of intermetallic compound Ti3Al, a new method of cryomill in liquid nitrogen was used to deal with the Ti/Al2O3 powders. The size distribution, phase composite and microstructure of the powders were analyzed using laser particle size analyzer, XRD, and TEM, respectively. Then, the performances of Ti/Al2O3 cermet sintered using cryomilled powders and room temperature milled powders were compared. The results show that, with the increase of cryomilling time, the grain size decreases shapely and high reactivitive nanoscale powders are finally obtained. With the cryomilling in liquid nitrogen, the Ti-N bonds are formed, which successfully prevent the oxidation of Ti. Ti/Al2O3 cermet sintered using cryomilled powders shows higher density, better mechanical properties than that using RT milled powders.

Key concepts: Materials science, Cermet, Intermetallic, Metallurgy, Microstructure, Composite number, Particle size, Phase (matter)

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